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https://home.ubalt.edu/tmitch/641/deci_ryan_2000.pdf Self-determination theory and the facilitation of intrinsic motivation, social development, and well-being
http://www.researchgate.net/publication/230764988_Impulsive_versus_reflective_influences_on_behavior_A_theoretical_framework_and_empirical_review Impulsive versus reflective influences on behavior: A theoretical framework and empirical review
http://www.researchgate.net/publication/225049864_Doing_What_Feels_Good_(and_Avoiding_What_Feels_Bad)-a_Growing_Recognition_of_the_Influence_of_Affect_on_Exercise_Behavior_a_Comment_on_Williams_et_al Doing What Feels Good (and Avoiding What Feels Bad)-a Growing Recognition of the Influence of Affect on Exercise Behavior: a Comment on Williams et al.
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https://books.google.ca/books?hl=en&lr=&id=oPHHwfdVvnwC&oi=fnd&pg=PA99&dq=Polivy+what+the+hell+effect&ots=TMf8ELxxMb&sig=bJ4qQUpll1eQXnyeLNMFPduA2pI#v=onepage&q=Polivy%20what%20the%20hell%20effect&f=false The 'what the hell'effect: Some effects of goal proximity and goal framing on performance